Christmas fern does fine in dry shade if you are looking for perennials. Native blueberries can also handle this condition and native azaleas once they are adapted.

I'm sure you realize that you do have water new plants the first year or so before they can handle being unsupplemented.

You might want to start with smaller sizes of shrubs and trees as those will adapt faster than more mature plants.

The link below has a nice list showing which shrubs will tolerate dry conditions and shade. There's just not very many that will tolerate both. Maple leaf viburnum is one I've seen recommended before that you didn't mention. What kind of dogwood did you lose? This lists pagoda dogwood and gray dogwood as drought and shade tolerant. You may have to click on the magnifying glass at the top and zoom in to be able to read this.

Here is a link that might be useful: native shrubs

Thanks for the link Christie. It's a great list. My dogwood was the standard B-flat Flowering dogwood. I missed a couple of weeks of watering late in the season, and that spelled it's doom.
Esa, christmas ferns are some of the more drought tolerant ones, but it's just too dry on my hill without regular watering. I have one native azalea (prinophylum) and it is the first plant to show water stress along with the hydrangaes. The blueberries are a good suggestion. I need to find some of the deerberries to plant because they color so well in the fall.

Letherleaf Viburnum grows very well in dry shade. It flowers in spring. Check out the link, it is one of my best info sources.

Here is a link that might be useful: Leatherleaf viburnum